黏滞阻尼器初始刚度的合理取值探讨

目前工程界关于黏滞阻尼器初始刚度的取值普遍较大,这与其实际性能差别较大。过大的初始刚度取值会大大高估黏滞阻尼器在风和地震下的耗能作用,使得结构设计偏于不安全。结合试验和有限元计算结果,验证了黏滞阻尼器加载刚度与其初始刚度数值上近似相等。结合一个工程案例,通过对非减震模型、不同减震模型的层间位移角、层间剪力、能量分布、附加阻尼比、滞回曲线的对比分析,阐述了黏滞阻尼器初始刚度的不合理取值可能会高估黏滞阻尼器的消能作用。

Discussion on reasonable selecting value of initial stiffness of viscous damper

At present, the selecting value of the initial stiffness of viscous damper is usually very large in engineering, which is significantly different from the actual performance of viscous damper. Excessive large selecting value of initial stiffness will greatly overestimate the energy dissipation of viscous dampers under wind and earthquake, making the structural design unsafe. Combined with test results and finite element calculation results, it was verified that the loading stiffness of the viscous damper is approximately equal to its initial stiffness. Combined with an engineering case, through the comparative analysis of the inter-storey drift, inter-storey shear force, energy distribution, additional damping ratio and hysteresis curve of non-damping models and different damping models, it was expounded that the unreasonable selecting value of initial stiffness of viscous dampers may overestimates the energy dissipation of viscous dampers.